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                            2016-09-30
                        
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                <h2 id="区域滑动吸附实现"><a href="#区域滑动吸附实现" class="headerlink" title="区域滑动吸附实现"></a>区域滑动吸附实现</h2><figure class="highlight plain"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div><div class="line">32</div><div class="line">33</div><div class="line">34</div><div class="line">35</div><div class="line">36</div><div class="line">37</div><div class="line">38</div><div class="line">39</div><div class="line">40</div><div class="line">41</div><div class="line">42</div><div class="line">43</div><div class="line">44</div><div class="line">45</div><div class="line">46</div><div class="line">47</div><div class="line">48</div><div class="line">49</div><div class="line">50</div><div class="line">51</div><div class="line">52</div><div class="line">53</div><div class="line">54</div><div class="line">55</div><div class="line">56</div><div class="line">57</div><div class="line">58</div><div class="line">59</div><div class="line">60</div><div class="line">61</div><div class="line">62</div><div class="line">63</div><div class="line">64</div><div class="line">65</div><div class="line">66</div><div class="line">67</div><div class="line">68</div><div class="line">69</div><div class="line">70</div><div class="line">71</div><div class="line">72</div><div class="line">73</div><div class="line">74</div><div class="line">75</div><div class="line">76</div><div class="line">77</div><div class="line">78</div><div class="line">79</div><div class="line">80</div><div class="line">81</div><div class="line">82</div><div class="line">83</div><div class="line">84</div><div class="line">85</div><div class="line">86</div><div class="line">87</div></pre></td><td class="code"><pre><div class="line">window.onload = function () &#123;</div><div class="line">    /*左侧区域滚动*/</div><div class="line">    leftScroll();</div><div class="line">&#125;</div><div class="line">var leftScroll = function () &#123;</div><div class="line">    /*</div><div class="line">    * 1.可以在滑动区间内滑动</div><div class="line">    * 2.如果超出了滑动区间停止滑动</div><div class="line">    * 3.如果超出了定位区间  吸附回去</div><div class="line">    * */</div><div class="line"></div><div class="line">    /*获取元素*/</div><div class="line">    var parentBox = document.querySelector(&apos;.jd_cate_left&apos;);</div><div class="line">    var childBox = parentBox.querySelector(&apos;ul&apos;);</div><div class="line"></div><div class="line">    /*确定区间*/</div><div class="line">    /*定位区间*/</div><div class="line">    var maxPosition = 0;</div><div class="line">    var minPosition = parentBox.offsetHeight - childBox.offsetHeight;</div><div class="line">    /*缓存距离*/</div><div class="line">    var distance = 100;</div><div class="line">    /*滑动的区间*/</div><div class="line">    var maxSwipe = maxPosition + distance;</div><div class="line">    var minSwipe = minPosition - distance;</div><div class="line"></div><div class="line">    var addTransition = function () &#123;</div><div class="line">        childBox.style.transition = &apos;all 0.2s&apos;;</div><div class="line">        childBox.style.webkitTransition = &apos;all 0.2s&apos;;</div><div class="line">    &#125;</div><div class="line">    var removeTransition = function () &#123;</div><div class="line">        childBox.style.transition = &apos;none&apos;;</div><div class="line">        childBox.style.webkitTransition = &apos;none&apos;;</div><div class="line">    &#125;</div><div class="line">    var setTranslateY = function (translateY) &#123;</div><div class="line">        childBox.style.transform = &apos;translateY(&apos;+translateY+&apos;px)&apos;;</div><div class="line">        childBox.style.webkitTransform = &apos;translateY(&apos;+translateY+&apos;px)&apos;;</div><div class="line">    &#125;</div><div class="line"></div><div class="line">    /*当前定位   核心*/</div><div class="line">    var currentY = 0;</div><div class="line"></div><div class="line"></div><div class="line">    /*滑动*/</div><div class="line">    var startY = 0;</div><div class="line">    var isMove = false;</div><div class="line">    var distanceY = 0;</div><div class="line">    childBox.addEventListener(&apos;touchstart&apos;,function (e) &#123;</div><div class="line">        startY = e.touches[0].clientY;</div><div class="line">    &#125;);</div><div class="line">    childBox.addEventListener(&apos;touchmove&apos;,function (e) &#123;</div><div class="line">        var moveY = e.touches[0].clientY;</div><div class="line">        distanceY = moveY - startY;</div><div class="line">        /*计算将要去做定位的位置*/</div><div class="line">        /*基于之前的位置 加上 当前改变的位置 */</div><div class="line">        removeTransition();</div><div class="line">        /*滑动区间内滑动*/</div><div class="line">        if((currentY + distanceY) &lt; maxSwipe &amp;&amp; (currentY + distanceY) &gt; minSwipe)&#123;</div><div class="line">            setTranslateY(currentY + distanceY);</div><div class="line">        &#125;</div><div class="line">        isMove = true;</div><div class="line">    &#125;);</div><div class="line">    childBox.addEventListener(&apos;touchend&apos;,function (e) &#123;</div><div class="line">        if(isMove)&#123;</div><div class="line">            /*如果超最大限制  定位到最大的定位*/</div><div class="line">            if((currentY + distanceY) &gt; maxPosition)&#123;</div><div class="line">                currentY = maxPosition;</div><div class="line">                addTransition();</div><div class="line">                setTranslateY(currentY);</div><div class="line">            &#125;</div><div class="line">            /*如果超最小限制  定位到最小的定位*/</div><div class="line">            else if((currentY + distanceY) &lt; minPosition)&#123;</div><div class="line">                currentY = minPosition;</div><div class="line">                addTransition();</div><div class="line">                setTranslateY(currentY);</div><div class="line">            &#125;</div><div class="line">            /*正常*/</div><div class="line">            else&#123;</div><div class="line">                /*记录当前定位*/</div><div class="line">                currentY = currentY + distanceY;</div><div class="line">            &#125;</div><div class="line">        &#125;</div><div class="line">        startY = 0;</div><div class="line">        isMove = false;</div><div class="line">        distanceY = 0;</div><div class="line">    &#125;);</div><div class="line">&#125;</div><div class="line">&#125;</div></pre></td></tr></table></figure>

                
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